Production of organic sulfonic acids.



sulfonating, are

unrrnn s'ra rgns n r orrion.

MICHAEL JLJINSKY, or onnrntn, GERMANY, ASSIGNOR TO n. wnnnkiun-e 00., OF UERDINGEN-ON-THE-RHINE, GERMANY.

PRODUCTION OF ORGAN-EC sutsonao some.

ratented March 12, 1907.

Application filed July 14, 1903. Serial No. 165,426.

To all whom it may concern.-

Be it known that 1, MIoI-IAEL JLJiNsxY, a subject of the Emperor of Russia, residing in Crefeld, in the Empire of Germany, have invented certain new and useful Improve ments in the Production of Organic Sulfonic Acids, of which the following is a specificat1on..

It has been proposed to sulfonate anthrachinone in the presence of mercury or mercury compounds. thereby obtaining the ortho (1) anthrachinone-mono-sulfonic acid or the ortho (1.5 and 1.8) disulfonic acids. have found also that other new sulfonic acids of the anthrachinone may be obtained the sodium salt of the 2.6 disulfomc acid or of the 2.7 disulfonic acid or a mixture of the two mixture is obtained in usual further treated with fuming sulfuric acid in the presence of mercury or mercury compounds.

Example 1: One hundred parts of anthrachinone 2.6 disulfonic-acid sodium, one part mercury sulfate, and two hundred parts fum ing sulfuric acid of forty per cent. free SO are slowly heated to 160 centigrade and kept there for about 2.5 hours. The sulfo salt passes gradually into solution. The sulfonated mixture 011 cooling forms a homogeneous tenacious mass and is exceedingly easily soluble in water. The aqueous solutionis neutralized with chalk, freed from. gypsum, and concentrated. The'resulting calcium-sodium salt of the new sulfo-acid is amorphous and very easily soluble in water.

A iiveper-cent. solution of the salt, with either chlorid of calcium or sulfate of copper,

s alts, as such a or acetate of lead, or concentrated hydrochloric acid in like volume, gives no precipitation of the corresponding salts or free sull'onic acid. The salt may be by melting with lime easily transformed into hitherto unknown oxy anthrachinone sulionic acid, which will dye inordanted wool a line violetred.

dium treated in the same way, with iuinin g suli'uric acid, but without the addition of mer cury, remains unchanged and yields in melting with lime anthralh vin acid.

Example ll: One hundred parts of anthrachinone 2.7 disulfonic-acid sodium, one part mercury sulfate, and two hundred parts funi- Antlu'achinone 2.6 disull'onic-acid so- 3 ing sulfuric acid of forty per cent. free S0 i are slowly heated to about 150 centigrade and kept there two hours. The dark-brown sulfonated mixture on cooling remains clear, but becomes of a tenacious consistency. The aqueous sulfonic-acid solution is neutralized with chalk, freed from gypsum, and concentrated. The resulting calcium-sodium salt of the new acid is likewise amorphous and very easily soluble in water, and a five-percent. solution thereof, likewise with either chlorid of calcium, or sulfate of copper, or

I acetate of lead, or concentrated hydrochloricacid in like volume, gives no precipitation of the corresponding salts or free sulfonic acid. By melting with lime there is obtained a hitherto unknown oxy anthrachinone sulfonic acid, which will dye mordanted wool a fine violet-red. Anthrachinone 2.7 disuli'onic-acid sodium treated in the same way with fuming sulfuric acid, but without the addition of mercury, remains unchanged and yields in melting with lime isoanthrailavin acid.

As the two acids obtained according to ous that in practice also the mixture may be employed which results ironi the usual sul- \fonating of the anthrachnione, which mix- Examples 1 and II are analogous, it is obviture contains the 2.6 and-2.7 disulfonic acid. The new acids are to be used to obtain iml portant dyestull's.

l claim as my invention 1. The new useful more basic anthrachinone-sull'onic acids having one sulfonic group in the ortho (1) positioiniorining a calciuml l sodium salt, being amorphous and very easilysoluble in water and yielding in melting with lime new oxy-antlirachiin)ne-sulfonic acids l (or dyeing niordantcd wool. a iine violet-rcd. l 2. .lrocess for obtaining the described new i anthrachiiumesul'lonic acids consisting in sul'l'onating the sodium. salt of the anthrachinone 2.6 disull'onic acid with fuming sul- 'l'uric acid in the presence of mercury.

in testimony whereof I have signed my name to tliisspccilication in the presence of two subscribing witnesses.

JLJINSKY.

l l MICHAEL Witnesses:

' (inns. l. HENSL'EY, l BRUCE WALLAon. 

